Cybus bussey



(Model.)

G, WEIGKUM.

:DOOR HANGER.-

, 10.400,278. Patentedlvar 2.6. 1889.

IIII.. Ill llu UNITED STATES ATnNT Friet.

GEORG VVEICKUM, OF VIENNA, AUSTRIA-HUNGARY.

DOOR-HANG ER.

SPECIFICATION forming part of Letters Patent No. 400,278, dated March 26, .1889.

Application filed April 6, 1887. Serial No. 233,903. (Model.) Patented in Austria-Hungary August 6, 1884, No. 17,695 and No= 35,155, and in Germany January 22, 1886,1To. 36,501.

F0 @ZZ whom, it may concern:

Be it known that l, GEORG WEICKUM, a su c-n ject of the Emperor of Austria-I-Iungary, and residing in Vienna, Empire of Austria-Hungary, have invented new and useful Improvements in Sliding Doors, (for which I have obtained Letters Patent in Germany, January 22, 1886, No. 36,501; in Austria, August 6,1884, No. 17,695, and in Hungary, August 6, 1884, No. 35,l55,) whereof the following is a specification.

lVIy invention relates to sliding doors supported by and rolling on two balls, and its object is to impart to the door a greater range of motion than with the ordinary construe tion, in which the door bears with a `flat surface on the balls. For this purpose I construct the bearing-surface of the door in form of an angular groove, the result thereby obtained being that the door rolls on small circles of the balls, while these roll on their greatest circles or their circumference, and that consequently the door is enabled to travel a greater difference than otherwise, as I will proceed to show with reference to the accompanying drawings, in whichd Figure I is a front elevation of the lower part of a door mounted on balls, both the bearing-surface of the door and that of the base being planed. y(Not having my invention applied.) Fig. II is a similar view, the door being grooved. Fig. III is an end view of the base, ball, and grooved portion of the door. Fig. IV is a similar detail view on a larger scale. Figs. V and VI are respectively front and end views, showing the principles of my invention applied to door-hangers.

If a door, A, Fig. I, of the annexed sheet of drawings (the lower portion of the door only being shown) is supported by two balls, b c, these balls require to be placed far enough apart from each other that the center line of gravity, f, of the door will always pass between the balls, as otherwise the door would tilt when being in either of its eXtreme positions. Thus in the door shown by the figure in its farthest position to the left (supposing this to be the closing position) the ball b is placed under the point o, being at the distance @c tothe left of the line f, while the ball c is in its outermost position to the right.

Now if q is a stop arranged to prevent the door from rolling away over the ball b, and p a point distant from the said stop by half the diameter D of the balls, it is evident that the door can only roll on and relatively to the balls a distance represented by the line p o, (or 11,) which is less than half the width of the door by the amount X and one-half the diameter of the ball added to the thickness of the stop q. Provided both the bottom edge of the door and the base a, supporting the balls, are plane surfaces, the balls will meanwhile roll on the said base by the same distance, and the entire range of motion of the door will be equal to twice the distance c, which is insufficient to allow the door to uncover the aperture e e', corresponding to its width. (In the drawings the door is shown in its extreme position to the right by dotted lines, the balls being then in the positions b and c.) This deficiency may be overcome by causing the door to roll on circles of the balls which are smaller than the circle with which the balls roll on the base a, the distance traveled by the balls over the base thereby becoming greater than the aforesaid distance fr. For this purpose I construct the surface with which the door rims on the balls in form of an angular groove straddling the balls, as shown by Figs. II, III, and IV. The door is th en supported by points g ofthe balls, belonging to circles of the diameter d, which is smaller than their greatest diameter D, and the door will roll relatively to the balls on the said smaller circles, whereas the balls roll on the base a with circles corresponding to their full diameter. The consequence of this is that while the door travels on the balls by the distance n the balls will have rolled a distance, u', which is greater than n in the same proportion as the diameter D is greater than the diameter d of the small circle, and which, primarily, depends upon the size of the angle formed by the two surfaces of the groove. By due determination of this angle the door may thus be rendered capable of being moved sufficiently to fully uncover the aperture e e.

Instead of supporting the door with its lower edge upon the balls, it may also besuspended thereon bymeans of a suitable frame attached to the top of thesame, and comprising a grooved bar, 7a, as shown by Figs. 'V and VI. rlhe door A is fixed to the said bar by the suspension-pieces m, and the bar is carried by the balls b c, rolling on a rail, h, fixed to the Wall of the building. For properly guiding the door the bar k is fitted with lugs l', grasping over the rail h. In order to prevent the balls from shifting relatively to each other and to the door, a guiding-piece is provided consistingl in a bar, Z, having near its ends recesses for the location of the balls, and also engaging with lugs over the rail h, While it engages with some play in a deepened portion of the groove of the bar 7c, closed at its ends. By means of rollers n the door is prevented from being accidentally tilted or lifted oil? the rail 71,.

I claim as my invention- 1. The combination of the sliding door A, having an angular groove, two balls, b c, and

`a surface supporting the balls, the door strad It is hereby certified that in Letters Patent No. 400,278, granted March 26, i upon the application of Georg Weiokum, of Vienna, Austria-Hungary, for an impl ment in Door-Hangers, an error appears in the printed specication requiring rection, as follows: In line 24, page l, the Word difference should read distance,- that the Letters Patent should be read with this correction therein that the saine conform to the record of the casein the Patent Office.

Signed, countersigned, and sealed this 2d day of April, D. 1889,

cYRUs BUssEY, Assistant Secretary o'f the Inte [SEAL] Countersigned C. E. MITCHELL,

Commissioner of Patents.y 

